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METAL CARBONYLATES 
- These are complexes which contain carbonyl 
ligands, bonded to a metal with a negative 
oxidation st...
Chemical Properties 
- Carbonylates are used in organic synthesis. Aldehydes 
(containing α-H atom) or ketones on treatmen...
A B C 
- In the above reactions, product B is obtained 
when one mole of each reactant is used. If two 
moles of the reage...
Bonding 
• Bonding in carbonylates is similar to that in 
carbonyls. 
• The metal will be in a negative oxidation state. 
...
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Metal carbonylates

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includes preparation methods and some chemical reactions of carbonylates.

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Metal carbonylates

  1. 1. METAL CARBONYLATES - These are complexes which contain carbonyl ligands, bonded to a metal with a negative oxidation state. e.g Re(CO)- 5 , Mn(CO)- 5 , Na2[Fe(CO)4] - Preparation: When sodium amalgam is taken in dry tetrahydrofuran and treated with Fe(CO)5 , Na2[Fe(CO)4] is obtained. (Iron is in -2 state) - When sodium amalgam is treated with Re2(CO)10 , Na[Re(CO)5] is obtained. (Re is in -1 state)
  2. 2. Chemical Properties - Carbonylates are used in organic synthesis. Aldehydes (containing α-H atom) or ketones on treatment with fomaldehyde and KHFe(CO)4 undergo reductive methylation. - α,β unsaturated carbonyl compounds on treatment with K[Fe(CO)4] yield their saturated derivatives. O KHFe(CO)4 O - KFe(CO)4 / KHFe(CO)4 on treatment with α,β unsaturated esters yield corresponding malonates. (Note: KFe(CO)4 is called potassium tetracarbonylferrate)
  3. 3. A B C - In the above reactions, product B is obtained when one mole of each reactant is used. If two moles of the reagents are used, then product C is obtained. - Cyanuric fluoride on reaction with KMn(CO)5 at low temperature yields substituted compounds. N N N F F F KMn(CO)5 N N N F F Mn(CO)5 - KF
  4. 4. Bonding • Bonding in carbonylates is similar to that in carbonyls. • The metal will be in a negative oxidation state. • The orbitals of the oxygen lie at a lower level than the corresponding orbitals of the carbon, due to the greater electronegativity of oxygen. • (Note: Draw MO diagram of CO as given in class) • 18 electron rule is valid in most cases.

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